Sawmill



erase" WM. GQ BRONSON, OF ERVIN, NEV YORK.

sAwivrILL.

i T allan/wm t mag/ccnccrnr Be itknown that I, WM. C. BRON-SON, of Erwin, in the county of Steuben and State of New .Yorin have invented certain new and useful Improvements in the Saw-Frames Employed in` Sawmills where Gangs of Saws are Used; andI do hereby declare that the following is a full, clear, and exact de scription of the same, reference being had to the accompanying drawings, forming part of this specification, in which-` Figure l, is a front elevation of part of a saw mill. Fig. 2, is a' vertical section of the same in the line p, g, shown in Fig. l. Fig. 3, is a vertical section of the main saw frame through the line r, s, shown in Figs. 2, and

4f. Fig. 4, is a horizontal section of the same in the line u, shown in Fig. 3. Fig. 5, is a vertical section in the line e, w, shown in Fig. l. Fig. 6, is avert-ical section of the main saw frame in the same direction as Fig. 2, but showing a different arrangement of saws. y'

` Similar' letters of reference indicate corresponding parts in each of the several fig- My invention consists in so constructing a saw gate or frame that it shall subserve net only the purpose of sustaining the tension, arising from the employment of gangs of I saws, to which it is peculiarly applicable,

but by its lightness and portability obviate the objection to the heavy frames usually employed: the more important object however of my invention and` which I would wish particularly to call attentionmis byiny mode of construction, I make the side stiles,

` or uprights, of the frame or gate, serve also the important office of `guide rods, and thus effect a combination entirely new; by the use of tubular wrought iron for the uprights (although `I do not restruct myself to the use of ironV alone) I am enabled tof permit air freely to circulate when the saw frame 1s in motion, through the only' partY ofthe frame liable to expansion, arising from friction in the slides, 2, which would elongate the stiles or uprights if solid, and disrupture temporary use of the resisting bars, placed be- "tween the lower hooked plate or bar to which the lower ends of the saws are at-` tached, and the upper open plate receiving gas tubing,

` double, but as the two structed, C, will be first described, its two Vsides are held at a distance apart by blocks slot c, (see Fig. 4,) lblocks areformed 4into loop tenons: al, d, which are iitted into Qform in the tubes B, .same as C, but the two sides have their fill- ,ing pieces united by from one to the other, the said piece e, standi ing above the sides and I groove or rabbet cut l forms a hook tongue f, 5 whole length of the cross head, it is provided with loop tenons d, cl, n

into similar openings in the tubes B, B; the ,filling pieces in each cross head fit close up {to the outside of the i heads and tubes are secured together by keys f g, g', of wood or metal, which iitinto'the loops of the tenons within the tubes ,a theser keys may be made all in one piece for each f tube so as to secure bothcross heads to the 1 tube at` the same time or in two pieces onel the saws: this tubular form is the only one the upper ends of the saws, to properly sustain the strain of all the saws, until the gang is placed in the saw frame or gate, (when the bars must be removed) by this means I am enabled by the use of duplicate gangs of saws, bars, ttc., to save considerable time, usually lost. by delay in setting' and sharpening, as the change of dull gang for a set may be made in a few minutes. A

'Io enable others skilled inthe art to make and use my invention I will proceed to describe its construction and operation. A, A, represent part of the mill framing 1n which the main saw frame B, B, C C', is

. hung.

B, B, are the cylindrical wrought iron tubes composed of what is usually termed being of suitable length to form the sides of the saw frame.

C, C, are two cross pieces or heads of equal length formed of wrought iron plate are diiferently conor filling pieces a, a, nearly close to theends,

`the blocks being secured by rivets Z), b; and

the space between the blocks forming a long the ends outside the B. C, is double, the

a piece e, extending having a V shaped all along .it which extending nearly the similar to C, lit-ting tubes and the cross for the end of each`(both arrangements being shown in Fig. 3) the tenons and keys in Veither case having `give a slight amount of draw, to make close a slight taper so as to joints. The tubular sides of the frame fit in suitable` guide boxes L, L, secured to the mill framing A, A.

D, is an open cross plate formed of double openings of suitable wrought iron plate with an opening between its sides (see Figs. 2, and 5,) butY closed at its ends.

E, is a hooked bar plate formed of wrought iron having a `V shaped groove along its back side which forms a hook tongue 7L, similar to the hook tongue E, on the lower cross head 0', of the main saw frame, but turned in the opposite direction shaped lugs j, y', and having loops or eyes at their upper ends which fit into the slot or opening between the sides of cross plate D; the eyes being placed transversely to the cross head; keys 7c, le, are fitted in the said loops, resting under the cross plate D.

i rIhe cross-plate D and hooked bar plate E are held together by the saws, but kept at a proper distance apart, and parallel by the bars F, F, which are removed after the gang is secured in the frame or gate.

G, Gr, are the saws, which have metal straps Z, Z, attached to their upper ends, the said straps passing through the opening between the sides of the cross plate D; they 'g have hooks m, m, attached to their lower ends which hookinto the groove or rabbet underv the hook-tongue z', on the hooked bar plate E, the saws being strained by keys u, n', passing through the straps Z, Z, above the cross plate D; they are held at a suitable distance apart by blocks of wood M, M, placed between them and secured or clamped by bolts passed through the blocks.

I-I, I-I, are suspension rods or links which pass through the slot c, in the upper cross head c, having eyes 0, 0, at their upper ends and hooks a2, m, at their lower ends, the hooks catcl'iing under one side of the cross plate l), and the eyes projecting above *50, andr having keys y, y, driven through them for the purpose of securing or tightening up the gang of saws within the main frame, the lower end of it being as before explained connected to the lower cross head of the main saw frame in such a manner as to insure great steadiness and stiffness. vThe saws are hung at the required distance apart Vand set ready for use before being put in the main frame, each saw being separately strained. The gang of saws is put intothe main frame with great facility by simply hooking the tongue h,

in the rabbet under the hook tongue f, on'

the lower cross head c, and dropping the hooked ends of the suspension links I'I, I-I, through the upper cross head c, of the main frame and through the cross plate D, under either side ofwhich they may be hooked; the keys y, y, arethen inserted in the eyes of the links and driven in to give all the links a uniform and proper tension; the links maybe provided with a double hook to hook under both sides of the cross-head, they must then be inserted from below the cross-plate D. The gang of saws are removed from the main frame by simply drawing the keys y, y.

I intend employing two or more gangs of saws in every mill for every main saw frame, so as to keep one gang of saws always in readiness to replace a gang which requires taking out and sharpening, and as the merely taking out one and putting in another set of saws occupies a very short space of time, while if the saws are sharpened in the mill or taken out one at a time a long stoppage is necessary, it will be readily understood that the saving of stoppage causes a great increase in the work performed by the mill.

The whole of the saw frame is rendered quite portable, and may be packed for transportation or storage in a very small cornpass; the main frame being taken apart by drawing the keys g, g; and gang of saws by drawing the keys n, n, or 7c, 76,' either being capable of being put together again in a few minutes. It is capable of being put in any reciprocating mill without any prepara tion as it requires no guides or fender posts to be fixed for it, its own sides forming its guides, the boxes L, L, merely requiring to be secured to the mill framing.

What I claim as my invention and desire Y to secure by Letteres Patent is 1. rIhe construction of a saw frame or gate of metal tubes B B constituting the guides as well as the uprights of said frame,

and cross pieces or heads c Cunited to saidv upright, in the manner set forth. Y 2. I also claim the arrangement of the cross Ahooked bar E and hoo-ks m m on the end of the saws in combination with the sustain* ing side bars F F and upper openplate D, for the purpose and in the manner substantially set forth in the foregoing specifica tion and accompanying drawings. Y

WM. c. BnoNsoN.

Witnesses O. D. MUNN, S. I-I. WALES. 

